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bpf/tests: Add zero-extension checks in BPF_ATOMIC tests 

This patch updates the existing tests of BPF_ATOMIC operations to verify
that a 32-bit register operand is properly zero-extended. In particular,
it checks the operation on archs that require 32-bit operands to be
properly zero-/sign-extended or the result is undefined, e.g. MIPS64.

Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20211001130348.3670534-3-johan.almbladh@anyfinetworks.com
This commit is contained in:
Johan Almbladh 2021-10-01 15:03:40 +02:00 committed by Daniel Borkmann
parent caaaa1667b
commit 89b6346276
1 changed files with 17 additions and 5 deletions
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22
lib/test_bpf.c
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@ -7398,15 +7398,20 @@ static struct bpf_test tests[] = {
* Individual tests are expanded from template macros for all
* combinations of ALU operation, word size and fetching.
*/
#define BPF_ATOMIC_POISON(width) ((width) == BPF_W ? (0xbaadf00dULL << 32) : 0)
#define BPF_ATOMIC_OP_TEST1(width, op, logic, old, update, result) \
{ \
"BPF_ATOMIC | " #width ", " #op ": Test: " \
#old " " #logic " " #update " = " #result, \
.u.insns_int = { \
BPF_ALU32_IMM(BPF_MOV, R5, update), \
BPF_LD_IMM64(R5, (update) | BPF_ATOMIC_POISON(width)), \
BPF_ST_MEM(width, R10, -40, old), \
BPF_ATOMIC_OP(width, op, R10, R5, -40), \
BPF_LDX_MEM(width, R0, R10, -40), \
BPF_ALU64_REG(BPF_MOV, R1, R0), \
BPF_ALU64_IMM(BPF_RSH, R1, 32), \
BPF_ALU64_REG(BPF_OR, R0, R1), \
BPF_EXIT_INSN(), \
}, \
INTERNAL, \
@ -7420,11 +7425,14 @@ static struct bpf_test tests[] = {
#old " " #logic " " #update " = " #result, \
.u.insns_int = { \
BPF_ALU64_REG(BPF_MOV, R1, R10), \
BPF_ALU32_IMM(BPF_MOV, R0, update), \
BPF_LD_IMM64(R0, (update) | BPF_ATOMIC_POISON(width)), \
BPF_ST_MEM(BPF_W, R10, -40, old), \
BPF_ATOMIC_OP(width, op, R10, R0, -40), \
BPF_ALU64_REG(BPF_MOV, R0, R10), \
BPF_ALU64_REG(BPF_SUB, R0, R1), \
BPF_ALU64_REG(BPF_MOV, R1, R0), \
BPF_ALU64_IMM(BPF_RSH, R1, 32), \
BPF_ALU64_REG(BPF_OR, R0, R1), \
BPF_EXIT_INSN(), \
}, \
INTERNAL, \
@ -7438,10 +7446,13 @@ static struct bpf_test tests[] = {
#old " " #logic " " #update " = " #result, \
.u.insns_int = { \
BPF_ALU64_REG(BPF_MOV, R0, R10), \
BPF_ALU32_IMM(BPF_MOV, R1, update), \
BPF_LD_IMM64(R1, (update) | BPF_ATOMIC_POISON(width)), \
BPF_ST_MEM(width, R10, -40, old), \
BPF_ATOMIC_OP(width, op, R10, R1, -40), \
BPF_ALU64_REG(BPF_SUB, R0, R10), \
BPF_ALU64_REG(BPF_MOV, R1, R0), \
BPF_ALU64_IMM(BPF_RSH, R1, 32), \
BPF_ALU64_REG(BPF_OR, R0, R1), \
BPF_EXIT_INSN(), \
}, \
INTERNAL, \
@ -7454,10 +7465,10 @@ static struct bpf_test tests[] = {
"BPF_ATOMIC | " #width ", " #op ": Test fetch: " \
#old " " #logic " " #update " = " #result, \
.u.insns_int = { \
BPF_ALU32_IMM(BPF_MOV, R3, update), \
BPF_LD_IMM64(R3, (update) | BPF_ATOMIC_POISON(width)), \
BPF_ST_MEM(width, R10, -40, old), \
BPF_ATOMIC_OP(width, op, R10, R3, -40), \
BPF_ALU64_REG(BPF_MOV, R0, R3), \
BPF_ALU32_REG(BPF_MOV, R0, R3), \
BPF_EXIT_INSN(), \
}, \
INTERNAL, \
@ -7555,6 +7566,7 @@ static struct bpf_test tests[] = {
BPF_ATOMIC_OP_TEST2(BPF_DW, BPF_XCHG, xchg, 0x12, 0xab, 0xab),
BPF_ATOMIC_OP_TEST3(BPF_DW, BPF_XCHG, xchg, 0x12, 0xab, 0xab),
BPF_ATOMIC_OP_TEST4(BPF_DW, BPF_XCHG, xchg, 0x12, 0xab, 0xab),
#undef BPF_ATOMIC_POISON
#undef BPF_ATOMIC_OP_TEST1
#undef BPF_ATOMIC_OP_TEST2
#undef BPF_ATOMIC_OP_TEST3